反应详情

温度

-78 °C

A solution of SmI2 (48 mL, 0.1N, 4.4 mmol) in tetrahydrofuran is treated with hexamethylphosphoramide (HMPA) (3.75 mL, 2.19 mmol) and stirred 5 minutes. A solution of 1-chloro-4- (2-iodoethyl) -benzene (0.6 g, 2.25 mmol) in tetrahydrofuran (5 mL) is added, stirred 10 minutes and cooled to -78° C. A catalytic amount of CuBr.DMS (45 rag, 0.225 mmol) is added to the reaction mixture which is stirred 5 minutes before a solution of 3-(3-oxo-3-phenyl-1-propenyl)-benzoic acid, methyl ester (0.4 g, 1.5 mmol) and trimethylsilyl chloride (0.75 mL, 5.58 mmol) in tetrahydrofuran (6 mL) is added. The reaction is stirred in the cold for 30 minutes, diluted with diethyl ether (400 mL), and filtered over a 2" cake of Al2O3. The ethereal solution is washed with water, dried (MgSO4), and stirred with a few drops of tetrabutylammonium fluoride for 2 hours. The reaction mixture is concentrated and columned over SiO2 eluting with dichloromethane to collect 0.5 g of an oil which is clean by PMR.

1. stirringstirred 10 minutes
2. additionis added
3. stirringThe reaction is stirred in the cold for 30 minutes
4. filtrationfiltered over a 2" cake of Al2O3
5. washThe ethereal solution is washed with water
6. dry with materialdried (MgSO4)
7. stirringstirred with a few drops of tetrabutylammonium fluoride for 2 hours
8. concentrationThe reaction mixture is concentrated
9. customto collect 0.5 g of an oil which